September 11 attacks

[W]e tell the Americans as people and we tell the mothers of soldiers and American mothers in general that if they value their lives and the lives of their children, to find a nationalistic government that will look after their interests and not the interests of the Jews. The continuation of tyranny will bring the fight to America, as [the 1993 World Trade Center bomber] Ramzi [Yousef] yourself and others did. This is my message to the American people: to look for a serious government that looks out for their interests and does not attack others, their lands, or their honour. My word to American journalists is not to ask why we did that but to ask what their government has done that forced us to defend ourselves.

— Osama bin Laden, in his interview with John Miller, May 1998, ^[27]

Osama bin Laden

Bin Laden orchestrated the September 11 attacks. He initially denied involvement, but later recanted his denial.

Shortly before the 2004 U.S. presidential election, bin Laden used a taped statement to publicly acknowledge Al-Qaeda's involvement in the attacks.^[28] He admitted his direct link to the attacks and said they were carried out because:

The events that affected my soul in a direct way started in 1982 when America permitted the Israelis to invade Lebanon and the American Sixth Fleet helped them in that. This bombardment began and many were killed and injured and others were terrorised and displaced.

I couldn't forget those moving scenes, blood and severed limbs, women and children sprawled everywhere. Houses were destroyed along with their occupants high rises demolished over their residents, rockets raining down on our home without mercy...As I looked at those demolished towers in Lebanon, it entered my mind that we should punish the oppressor in kind and that we should destroy towers in America so that they taste some of what we tasted and so that they be deterred from killing our women and children.

And that day, it was confirmed to me that oppression and the intentional killing of innocent women and children is a deliberate American policy. Destruction is freedom and democracy, while resistance is terrorism and intolerance.^[34]

Bin Laden personally directed his followers to attack the World Trade Center and the Pentagon.^[35][36] Another video obtained by Al Jazeera in September 2006 showed bin Laden with one of the attacks' chief planners, Ramzi bin al-Shibh, as well as hijackers, Hamza al-Ghamdi and Wail al-Shehri, amidst making preparations for the attacks.^[37] Bin Laden had been on the FBI's Most Wanted List since 1998 for the 1998 bombings of the U.S. embassies in Tanzania and Kenya.^[38][39]

Khalid Sheikh Mohammed and other Al-Qaeda members

Journalist Yosri Fouda of the Arabic television channel Al Jazeera reported that in April 2002 Al-Qaeda member Khalid Sheikh Mohammed admitted his involvement in the attacks, along with Ramzi bin al-Shibh.^[40][41][42] The 2004 9/11 Commission Report determined that Mohammed's animosity towards the United States, the principal architect of the 9/11 attacks, stemmed from his "violent disagreement with U.S. foreign policy favoring Israel".^[43] Mohammed was also an adviser and financier of the 1993 World Trade Center bombing and the uncle of Ramzi Yousef, the lead bomber in that attack.^[44][45] In late 1994, Mohammed and Yousef moved on to plan a new terrorist attack called the Bojinka plot planned for January 1995. Despite a failure and Yousef's capture by U.S. forces the following month, the Bojinka plot would influence the later 9/11 attacks.^[46]

In "Substitution for Testimony of Khalid Sheikh Mohammed" from the trial of Zacarias Moussaoui, five people are identified as having been completely aware of the operation's details. They are bin Laden; Khalid Sheikh Mohammed; Ramzi bin al-Shibh; Abu Turab al-Urduni; and Mohammed Atef.^[47]

Motives

Osama bin Laden's declaration of a holy war against the United States, and a 1998 fatwā signed by bin Laden and others that called for the killing of Americans,^[22][48] are seen by investigators as evidence of his motivation.^[49] During his interview with Hamid Mir in November 2001, Bin Laden defended the September 11 attacks as retaliatory strikes against American atrocities against Muslims across the world. He also maintained that the attacks were not directed against women and children, asserting that the targets of the strikes were symbols of America's "economic and military power".^[50][51]

In bin Laden's November 2002 "

• U.S. support of Israel^[52][53]
• Bin Laden's strategy to support and globally expand the
  Al-Aqsa Intifada^{[54][55][56][57]}
• Attacks against Muslims by U.S.-led coalition in Somalia
• U.S. support of the government of Philippines against Muslims in the Moro conflict
• U.S. support for the Israeli occupation of Southern Lebanon
• U.S. support of Russian atrocities against Muslims in Chechnya
• Pro-American governments in the Middle East (who "act as your agents") being against Muslim interests
• U.S. support of Indian oppression against Muslims in Kashmir
• The presence of U.S. troops in Saudi Arabia^[58]
• The
  sanctions against Iraq^[52]
• Environmental destruction^[59][60][61]

After the attacks, bin Laden and Ayman al-Zawahiri released additional videotapes and audio recordings, some of which repeated the above reasons for the attacks. Two relevant publications were bin Laden's 2002 "Letter to the American people"^[62] and a 2004 videotape by bin Laden.^[63]

As an adherent of

In a December 1999 interview, bin Laden said he felt that Americans were "too near to Mecca", and considered this a provocation to the entire Muslim world.^[67] One analysis of suicide terrorism suggested that without U.S. troops in Saudi Arabia, Al-Qaeda likely would not have been able to get people to commit to suicide missions.^[68]

In the 1998 fatwā, Al-Qaeda identified the Iraq sanctions as a reason to kill Americans, condemning the "protracted blockade" among other actions that constitute a declaration of war against "Allah, his messenger, and Muslims".

In 2004, bin Laden claimed that the idea of destroying the towers had first occurred to him in 1982 when he witnessed Israel's bombardment of high-rise apartment buildings during the 1982 Lebanon War.^[70][71] Some analysts, including political scientists John Mearsheimer and Stephen Walt, also claimed that U.S. support of Israel was a motive for the attacks.^[53][67] In 2004 and 2010, bin Laden again connected the September 11 attacks with U.S. support of Israel, although most of the letters expressed bin Laden's disdain for President Bush and bin Laden's hope to "destroy and bankrupt" the U.S.^[72][73]

Other motives have been suggested in addition to those stated by bin Laden and Al-Qaeda. Some authors suggested the "humiliation" that resulted from the Islamic world falling behind the Western world – this discrepancy was rendered especially visible by globalization^[74][75] and a desire to provoke the U.S. into a broader war against the Islamic world in the hope of motivating more allies to support Al-Qaeda. Similarly, others have argued the 9/11 attacks were a strategic move to provoke America into a war that would incite a pan-Islamic revolution.^[76][77]

Documents seized during the 2011 operation that killed bin Laden included a few notes handwritten by bin Laden in September 2002 with the heading "The Birth of the Idea of September 11". In these notes, he describes how he was inspired by the crash of EgyptAir Flight 990 on October 31, 1999, which was deliberately crashed by co-pilot Gameel Al-Batouti. "This is how the idea of 9/11 was conceived and developed in my head, and that is when we began the planning" bin Laden continued, adding that no one but Abu Hafs and Abu al-Khair knew about it at the time. The 9/11 Commission Report identified Khalid Sheikh Mohammed as the architect of 9/11, but he is not mentioned in bin Laden's notes.^[78]

Planning

The attacks were conceived by Khalid Sheikh Mohammed, who first presented it to Osama bin Laden in 1996.^[79] At that time, bin Laden and Al-Qaeda were in a period of transition, having just relocated back to Afghanistan from Sudan.^[80] The 1998 African embassy bombings and bin Laden's February 1998 fatwā marked a turning point of Al-Qaeda's terrorist operation,^[81] as bin Laden became intent on attacking the United States.

In late 1998 or early 1999, bin Laden approved Mohammed to go forward with organizing the plot.^[82] Mohammed, bin Laden, and Mohammed Atef, bin Laden's deputy, held a series of meetings in early 1999.^[83] Atef provided operational support, including target selections and helping arrange travel for the hijackers.^[80] Bin Laden overruled Mohammed, rejecting potential targets such as the U.S. Bank Tower in Los Angeles for lack of time.^[84][85]

Bin Laden provided leadership and financial support and was involved in selecting participants.

In late 1999, a group of men from Hamburg, Germany, arrived in Afghanistan. The group included Mohamed Atta, Marwan al-Shehhi, Ziad Jarrah, and Ramzi bin al-Shibh.^[89] Bin Laden selected these men because they were educated, could speak English, and had experience living in the West.^[90] New recruits were routinely screened for special skills and Al-Qaeda leaders consequently discovered that Hani Hanjour already had a commercial pilot's license.^[91] Mohammed later said that he helped the hijackers blend in by teaching them how to order food in restaurants and dress in Western clothing.^[92]

Hanjour arrived in San Diego on December 8, 2000, joining Hazmi.^{[93]: 6–7} They soon left for Arizona, where Hanjour took refresher training.^[93]: 7 Marwan al-Shehhi arrived at the end of May 2000, while Atta arrived on June 3, 2000, and Jarrah arrived on June 27, 2000.^[93]: 6 Bin al-Shibh applied several times for a visa to the United States, but as a Yemeni, he was rejected out of concerns he would overstay his visa.^{[93]: 4, 14} Bin al-Shibh stayed in Hamburg, providing coordination between Atta and Mohammed.^[93]: 16 The three Hamburg cell members all took pilot training in South Florida at Huffman Aviation.^[93]: 6

In the spring of 2001, the secondary hijackers began arriving in the United States.^[94] In July 2001, Atta met with bin al-Shibh in Tarragona, Catalonia, Spain, where they coordinated details of the plot, including final target selection. Bin al-Shibh also passed along bin Laden's wish for the attacks to be carried out as soon as possible.^[95] Some of the hijackers received passports from corrupt Saudi officials who were family members or used fraudulent passports to gain entry.^[96]

There have been a few theories that 9/11 was selected by the hijackers as the date of the attack because it resembled

In late 1999, Al-Qaeda associate

The CIA had already been alerted by Saudi intelligence about the status of Mihdhar and Hazmi as Al-Qaeda members and a CIA team broke into Mihdhar's

By late June, senior counter-terrorism official Richard Clarke and CIA director George Tenet were "convinced that a major series of attacks was about to come", although the CIA believed the attacks would likely occur in Saudi Arabia or Israel.^[99] In early July, Clarke put domestic agencies on "full alert", telling them, "Something spectacular is going to happen here, and it's going to happen soon". He asked the FBI and the State Department to alert the embassies and police departments, and the Defense Department to go to "Threat Condition Delta".^[100][101] Clarke later wrote: "Somewhere in CIA there was information that two known al Qaeda terrorists had come into the United States. Somewhere in the FBI, there was information that strange things had been going on at flight schools in the United States ... They had specific information about individual terrorists from which one could have deduced what was about to happen. None of that information got to me or the White House".^[102]

On July 13, Tom Wilshire, a CIA agent assigned to the FBI's international terrorism division, emailed his superiors at the CIA's

The same day in July, Margarette Gillespie, an FBI analyst working in the CTC, was told to review material about the Malaysia meeting. She was not told of the participant's presence in the U.S. The CIA gave Gillespie surveillance photos of Mihdhar and Hazmi from the meeting to show to FBI counterterrorism but did not tell her their significance. The Intelink database informed her not to share intelligence material at the meeting with criminal investigators. When shown the photos, the FBI refused more details on their significance, and they were not given Mihdhar's date of birth or passport number.[105] In late August 2001, Gillespie told the INS, the State Department, the Customs Service, and the FBI to put Hazmi and Mihdhar on their watchlists, but the FBI was prohibited from using criminal agents in searching for the duo, hindering their efforts.^[106]

Also in July, a Phoenix-based FBI agent sent a message to FBI headquarters, Alec Station, and FBI agents in New York alerting them to "the possibility of a coordinated effort by Osama bin Laden to send students to the United States to attend civil aviation universities and colleges". The agent, Kenneth Williams, suggested the need to interview all flight school managers and identify all Arab students seeking flight training.^[107] In July, Jordan alerted the U.S. that Al-Qaeda was planning an attack on the U.S.; "months later", Jordan notified the U.S. that the attack's codename was "The Big Wedding" and that it involved aeroplanes.^[108]

On August 6, 2001, the CIA's Presidential Daily Brief ("PDB"), designated "For the President Only", was entitled Bin Ladin Determined to Strike in US. The memo noted that FBI information "indicates patterns of suspicious activity in this country consistent with preparations for hijackings or other types of attacks".^[109]

In mid-August, one Minnesota flight school alerted the FBI about Zacarias Moussaoui, who had asked "suspicious questions". The FBI found that Moussaoui was a radical who had travelled to Pakistan, and the INS arrested him for overstaying his French visa. Their request to search his laptop was denied by FBI headquarters due to the lack of probable cause.^[110]

The failures in intelligence-sharing were attributed to 1995 Justice Department policies limiting intelligence-sharing, combined with CIA and NSA reluctance to reveal "sensitive sources and methods" such as tapped phones.^[111] Testifying before the 9/11 Commission in April 2004, then – Attorney General John Ashcroft recalled that the "single greatest structural cause for the September 11th problem was the wall that segregated or separated criminal investigators and intelligence agents".^[112] Clarke also wrote: "[T]here were... failures to get information to the right place at the right time".^[113]

Attacks

Early on the morning of Tuesday, September 11, 2001,

* Eastern Daylight Time (UTC−04:00)
^† Excluding hijackers
^§ Including emergency workers
^‡ Including hijackers

The four crashes

At 7:59 a.m., American Airlines Flight 11 took off from Logan International Airport in Boston.^[116] Fifteen minutes into the flight, five hijackers armed with boxcutters took over the plane, injuring at least three people (and possibly killing one)^{[117][118][119]} before forcing their way into the cockpit. The terrorists also displayed an apparent explosive and sprayed mace into the cabin, to frighten the hostages into submission and further hinder resistance.^[120] Back at Logan, United Airlines Flight 175 took off at 8:14 a.m., approximately the same time as Flight 11's hijacking.^[121] Hundreds of miles southwest at Dulles International Airport, American Airlines Flight 77 left the runway at 8:20 a.m.^[121] Flight 175's journey proceeded normally for 28 minutes until 8:42 a.m., when a group of five hijacked the plane, murdering both pilots and stabbing several crew members before assuming control of the aircraft. These hijackers also used bomb threats to instil fear into the passengers and crew,^[122] also spraying chemical weapons to disable any opposition.^[123] Concurrently, United Airlines Flight 93 departed from Newark International Airport in New Jersey;^[121] originally scheduled to pull away from the gate at 8:00 a.m., the plane was running 42 minutes late.

At 8:46 a.m., Flight 11 was deliberately crashed into the north face of the World Trade Center's North Tower (1 WTC),^[124] although the initial presumption by many was that this was merely an accident.^[125] At 8:51 a.m., American Airlines Flight 77 was also taken over by another group of five who forcibly entered the cockpit 31 minutes after takeoff.^[126] Although the hijackers on this flight were equipped with knives,^[127] there were no reports of anyone on board being stabbed, nor did the two people who made phone calls mention the use of mace or a bomb threat.

Seventeen minutes after the first plane crashed into the North Tower, Flight 175 was flown into the South Tower's southern facade (2 WTC)^[128] at 9:03 a.m.,^[g] demonstrating that the first crash was not an accident, but rather a terrorist attack.^[129][130]

Four men aboard Flight 93 struck suddenly, killing at least one passenger, after having waited 46 minutes to make their move—a holdup that proved disastrous for the terrorists when combined with the delayed takeoff from the runway;^[131] they stormed the cockpit and seized control of the plane at 9:28 a.m., turning the plane eastbound and setting course for Washington, D.C.^[132] Much like their counterparts on the first two flights, the fourth team also used bomb threats and filled the cabin with mace.^[133]

Nine minutes after Flight 93's hijacking, Flight 77 crashed into the west side of the Pentagon.^[134] Because of the two delays,^[135] the passengers and crew of Flight 93 had time to be made aware of the previous attacks through phone calls to the ground, and as a result an uprising was hastily organized to take control of the aircraft at 9:57 a.m.^[136] Within minutes, passengers had fought their way to the front of the cabin and began breaking down the cockpit door. Fearing their captives would gain the upper hand, the hijackers rolled the plane and pitched it into a nosedive,^[137][138] crashing into a field near Shanksville, Pennsylvania, southeast of Pittsburgh, at 10:03 a.m. The plane was about twenty minutes away from reaching D.C. at the time of the crash, and its target is believed to have been either the Capitol Building or the White House.^[115][136]

Some passengers and crew members who called from the aircraft using the cabin air phone service and mobile phones provided details: several hijackers were aboard each plane; they used mace, tear gas, or pepper spray to overcome attendants; and some people aboard had been stabbed.^[139] Reports indicated hijackers stabbed and killed pilots, flight attendants, and one or more passengers.^[114][140] According to the 9/11 Commission's final report, the hijackers had recently purchased multi-function hand tools and assorted Leatherman-type utility knives with locking blades (which were not forbidden to passengers at the time), but these were not found among the possessions left behind by the hijackers.^[141][142] A flight attendant on Flight 11, a passenger on Flight 175, and passengers on Flight 93 said the hijackers had bombs, but one of the passengers said he thought the bombs were fake. The FBI found no traces of explosives at the crash sites, and the 9/11 Commission concluded that the bombs were probably fake.^[114] On at least two of the hijacked flights—American 11 and United 93—the terrorists claimed over the PA system that they were taking hostages and were returning to the airport to have a ransom demand met, a clear attempt to prevent passengers from fighting back. Both attempts failed, however, as both hijacker pilots in these instances (Mohamed Atta^[143] and Ziad Jarrah,^[144] respectively) keyed the wrong switch and mistakenly transmitted their messages to ATC instead of the people on the plane as intended, tipping off the flight controllers that the planes had been hijacked.

Three buildings in the World Trade Center collapsed due to fire-induced structural failure. Although the South Tower was struck 17 minutes after the North Tower, the plane's impact zone was far lower, at a much faster speed, and into a corner, with the unevenly-balanced additional structural weight causing it to collapse first at 9:59 a.m.,^{[146]: 80 [147]: 322} having burned for 56 minutes^[i] in the fire caused by the crash of United Airlines Flight 175 and the explosion of its fuel. The North Tower lasted another 29 minutes before collapsing at 10:28 a.m.,^[j] one hour and forty-two minutes^[h] after being struck by American Airlines Flight 11. When the North Tower collapsed, debris fell on the nearby 7 World Trade Center building (7 WTC), damaging the building and starting fires. These fires burned for nearly seven hours, compromising the building's structural integrity, and 7 WTC collapsed at 5:21 p.m.^[151][152] The west side of the Pentagon sustained significant damage.

At 9:42 a.m., the

In an April 2002 interview, Khalid Sheikh Mohammed and Ramzi bin al-Shibh, who are believed to have organized the attacks, said Flight 93's intended target was the United States Capitol, not the White House.^[157] During the planning stage of the attacks, Mohamed Atta (Flight 11's hijacker and pilot) thought the White House might be too tough a target and sought an assessment from Hani Hanjour (who hijacked and piloted Flight 77).^[158] Mohammed said Al-Qaeda initially planned to target nuclear installations rather than the World Trade Center and the Pentagon, but decided against it, fearing things could "get out of control".^[159] Final decisions on targets, according to Mohammed, were left in the hands of the pilots.^[158] If any pilot could not reach his intended target, he was to crash the plane.^[115]

Casualties

The attack on the World Trade Center's North Tower single-handedly^[k] made 9/11 the deadliest act of terrorism in world history.^[162] Taken together, the four crashes caused the deaths of 2,996 people (including the hijackers) and injured thousands more.^[163] The death toll included 265 on the four planes (from which there were no survivors); 2,606 in the World Trade Center and in the surrounding area; and 125 at The Pentagon.^[164][165] Most who died were civilians, as well as 343 firefighters, 72 law enforcement officers, 55 military personnel, and the 19 terrorists.^[166][167] After New York, New Jersey lost the most state citizens.^[168] More than 90 countries lost citizens in the attacks.^[169]

In New York City, more than 90% of the workers and visitors who died in the towers had been at or above the points of impact. In the North Tower, between 1,344^[170] and 1,402^[171] people were at, above or one floor below the point of impact and all died. Hundreds were killed instantly the moment the plane struck.^[172] The estimated 800 people^[173] who survived the impact were trapped and died in the fires or from smoke inhalation; fell or jumped from the tower to escape the smoke and flames; or were killed in the building's collapse. The destruction of all three staircases in the North Tower when Flight 11 hit made it impossible for anyone from the impact zone upward to escape. 107 people not trapped by the impact died.^[174] When the plane struck between floors 93 and 99, the 92nd floor was also rendered inescapable when the crash severed all elevator shafts while debris falling from the impact zone blocked the stairwells, ensuring the deaths of all 69 workers on the floor below the point of impact.

In the South Tower, around 600 people were on or above the 77th floor when Flight 175 struck and few survived. As with the North Tower, hundreds were killed at the moment of impact. Unlike those in the North Tower, the estimated 300 survivors

At the World Trade Center complex, a total of 414 emergency workers died as they tried to rescue people and fight fires, while another law enforcement officer was separately killed when United 93 crashed. The

Port Authority Police Department (PAPD) lost 37 officers.^[186] Eight emergency medical technicians (EMTs) and paramedics from private emergency medical services (EMS) units were killed.^[187] Almost all of the emergency personnel who died at the scene that day were killed as a result of the towers collapsing, with the exception of one who was struck by a civilian falling from the upper floors of the South Tower.^[188]

Aon Corporation were also killed.^[192] The National Institute of Standards and Technology (NIST) estimated that about 17,400 civilians were in the World Trade Center complex at the time of the attacks. Turnstile counts from the Port Authority suggest 14,154 people were typically in the Twin Towers by 8:45 a.m.^{[193][page needed][194]} Most people below the impact zone safely evacuated the buildings.^[195]

In

Lieutenant General Timothy Maude, an Army Deputy Chief of Staff, was the highest-ranking military official killed at the Pentagon.^[199]

Weeks after the attack, the death toll was estimated to be over 6,000, more than twice the number of deaths eventually confirmed.[200] The city was only able to identify remains for about 1,600 of the World Trade Center victims. The medical examiner's office collected "about 10,000 unidentified bone and tissue fragments that cannot be matched to the list of the dead".^[201] Bone fragments were still being found in 2006 by workers who were preparing to demolish the damaged Deutsche Bank Building.

In 2010, a team of anthropologists and archaeologists searched for human remains and personal items at the Fresh Kills Landfill, where 72 more human remains were recovered, bringing the total found to 1,845. DNA profiling continues in an attempt to identify additional victims.^{[202][203][204]} The remains are being held in storage in Memorial Park, outside the New York City Medical Examiner's facilities. It was expected that the remains would be moved in 2013 to a repository behind a wall at the 9/11 museum.^{[needs update][205]}

In July 2011, a team of scientists at the Office of Chief Medical Examiner continued efforts to identify remains, in the hope that improved technology will allow them to identify other victims.^[204] In August 2017, the 1,641st victim was identified as a result of newly available DNA technology,^[206] and a 1,642nd during July 2018.^[207] Three more victims were identified in October 2019,^[208] two in September 2021^[209] and an additional two in September 2023.^[210] As of September 2023, 1,104 victims remain unidentified,^[210] amounting to 40% of the deaths in the World Trade Center attacks.^[209] On September 25, 2023, the FDNY reported that with the death of EMT Hilda Vannata and retired firefighter Robert Fulco, marking the 342nd and 343rd deaths from 9/11-related illnesses, the department had now lost the same number of firefighters, EMTs, and civilian members to 9/11-related illnesses as it did on the day of the attacks.^[211][212]

Damage

Further information: Collapse of the World Trade Center

Along with the 110-floor

St. Nicholas Greek Orthodox Church.^[213] The North Tower, South Tower, the Marriott Hotel (3 WTC), and 7 WTC were destroyed. The U.S. Customs House (6 World Trade Center), 4 World Trade Center, 5 World Trade Center, and both pedestrian bridges connecting buildings were severely damaged. The Deutsche Bank Building (still popularly referred to as the Bankers Trust Building) on 130 Liberty Street was partially damaged and demolished some years later, starting in 2007.^[214][215] The two buildings of the World Financial Center also suffered damage.^[214] The last fires at the World Trade Center site were extinguished on December 20, exactly 100 days after the attacks.^[216]

The Deutsche Bank Building across Liberty Street from the World Trade Center complex was later condemned as uninhabitable because of toxic conditions inside the office tower and was deconstructed.^[217][218] The Borough of Manhattan Community College's Fiterman Hall at 30 West Broadway was condemned due to extensive damage from the attacks, and then reopened in 2012.^[219]

Other neighbouring buildings (including

Millenium Hilton, and 90 Church Street had moderate damage and have since been restored.^[221] Communications equipment on top of the North Tower was also destroyed, with only WCBS-TV maintaining a backup transmitter on the Empire State Building, but media stations were quickly able to reroute the signals and resume their broadcasts.^[213][222]

The

World Trade Center Transportation Hub, which reopened in March 2015.^[224][225] The Cortlandt Street station on the New York City Subway's IRT Broadway–Seventh Avenue Line was also in close proximity to the World Trade Center complex, and the entire station, along with the surrounding track, was reduced to rubble.^[226] The latter station was rebuilt and reopened to the public on September 8, 2018.^[227]

The Pentagon was extensively damaged by the impact of American Airlines Flight 77 and the ensuing fires, causing one section of the building to collapse.[228] As the aeroplane approached the Pentagon, its wings knocked down light poles and its right engine hit a power generator before crashing into the western side of the building.^[229][230] The plane hit the Pentagon at the first-floor level. The front part of the fuselage disintegrated on impact, while the mid and tail sections kept moving for another fraction of a second.^[231] Debris from the tail section penetrated the furthest into the building, breaking through 310 feet (94 m) of the three outermost of the building's five rings.^[231][232]

Rescue efforts

Main article: Rescue and recovery effort after the September 11 attacks on the World Trade Center

See also: List of emergency and first responder agencies that responded to the September 11 attacks

U.S. Army Corps of Engineers

on its way to assist the site on September 11, 2001

The New York City Fire Department (FDNY) deployed more than 200 units (approximately half of the department) to the World Trade Center.^[233] Their efforts were supplemented by numerous off-duty firefighters and emergency medical technicians.^{[234][233][235]} The New York City Police Department (NYPD) sent its Emergency Service Units and other police personnel and deployed its aviation unit.^[236] The NYPD aviation unit assessed the situation and decided that helicopter rescues from the towers were not feasible.^[237] Numerous police officers of the Port Authority Police Department (PAPD) also participated in rescue efforts.^[238] Once on the scene, the FDNY, the NYPD, and the PAPD did not coordinate efforts and performed redundant searches for civilians.^[234][239]

As conditions deteriorated, the NYPD aviation unit relayed information to police commanders, who issued orders for personnel to evacuate the towers; most NYPD officers were able to safely evacuate before the buildings collapsed.^[239][240] With separate command posts set up and incompatible radio communications between the agencies, warnings were not passed along to FDNY commanders.^[241]

After the first tower collapsed, FDNY commanders issued evacuation warnings. Due to

technical difficulties with malfunctioning radio repeater systems, many firefighters never heard the evacuation orders. 9-1-1 dispatchers also received information from callers that was not passed along to commanders on the scene.^[233]

Reactions

Main article: Reactions to the September 11 attacks

See also: Timeline for September following the September 11 attacks

The 9/11 attacks resulted in immediate responses to the event, including domestic reactions; closings and cancellations; hate crimes; Muslim-American responses to the event; international responses to the attack; and military responses to the events. Shortly after the attacks, a U.S. government fund that was created by an Act of Congress named the September 11th Victim Compensation Fund.^[242][243] The purpose of the fund was to compensate the victims of the attacks and their families with the quid pro quo of their agreement not to file lawsuits against the airline corporations involved.^[244] Legislation authorizes the fund to disburse a maximum of $7.375 billion, including operational and administrative costs, of U.S. government funds.^[245] The fund was set to expire by 2020 but was in 2019 prolonged to allow claims to be filed until October 2090.^[246][247]

Immediate response

Further information: U.S. military response during the September 11 attacks

See also: Communication during the September 11 attacks

At 8:32 a.m.,

North American Aerospace Defense Command (NORAD). NORAD scrambled two F-15s from Otis Air National Guard Base

in Massachusetts and they were airborne by 8:53 a.m. Because of slow and confused communication from FAA officials, NORAD had nine minutes' notice, and no notice about any of the other flights before they crashed.

After both of the Twin Towers had already been hit, more fighters were scrambled from Langley Air Force Base in Virginia at 9:30 a.m.^[248] At 10:20 a.m., Vice President Dick Cheney issued orders to shoot down any commercial aircraft that could be positively identified as being hijacked. These instructions were not relayed in time for the fighters to take action.^{[248][249][250]} Some fighters took to the air without live ammunition, knowing that to prevent the hijackers from striking their intended targets, the pilots might have to intercept and crash their fighters into the hijacked planes, possibly ejecting at the last moment.^[251]

For the first time in U.S. history, the emergency preparedness plan called Security Control of Air Traffic and Air Navigation Aids (SCATANA) was invoked,^[252] thus stranding tens of thousands of passengers across the world.^[253] Ben Sliney, in his first day as the National Operations Manager of the FAA,^[254] ordered that American airspace would be closed to all international flights, causing about 500 flights to be turned back or redirected to other countries. Canada received 226 of the diverted flights and launched Operation Yellow Ribbon to deal with the large numbers of grounded planes and stranded passengers.^[255]

The 9/11 attacks had immediate effects on the American people.^[256] Police and rescue workers from around the country took a leave of absence from their jobs and travelled to New York City to help recover bodies from the twisted remnants of the Twin Towers.^[257] Blood donations across the U.S. surged in the weeks after 9/11.^[258][259]

The deaths of adults in the attacks resulted in over 3,000 children losing a parent.^[260] Subsequent studies documented children's reactions to these actual losses and feared losses of life, the protective environment in the attacks' aftermath, and the effects on surviving caregivers.^{[261][262][263]}

Domestic reactions

Further information: U.S. government response to the September 11 attacks

President Bush addressing the nation from the White House at 8:30 PM ET

Bush speaking to rescue workers at Ground Zero on September 14

During a speech to a joint session of Congress, President George W. Bush pledges "to defend freedom against terrorism". September 20, 2001 (audio only).

Following the attacks, President George W. Bush's approval rating increased to 90%.^[264] On September 20, 2001, he addressed the nation and a joint session of Congress regarding the events of September 11 and the subsequent nine days of rescue and recovery efforts, and described his intended response to the attacks. New York City mayor Rudy Giuliani's highly visible role resulted in praise in New York and nationally.^[265]

Many relief funds were immediately set up to assist the attacks' victims, with the task of providing financial assistance to the survivors of the attacks and the victims' families. By the deadline for victims' compensation on September 11, 2003, 2,833 applications had been received from the families of those who were killed.^[266]

Contingency plans for the continuity of government and the evacuation of leaders were implemented soon after the attacks.^[253] Congress was not told that the United States had been under a continuity of government status until February 2002.^[267]

In the largest restructuring of the U.S. government in contemporary history, the United States enacted the

USA PATRIOT Act, saying it would help detect and prosecute terrorism and other crimes.^[268] Civil liberties groups have criticized the PATRIOT Act, saying it allows law enforcement to invade citizens' privacy and that it eliminates judicial oversight of law enforcement and domestic intelligence.^{[269][270][271]}

To effectively combat future acts of terrorism, the

warrantless surveillance of telecommunications, which was sometimes criticized as permitting the agency "to eavesdrop on telephone and e-mail communications between the United States and people overseas without a warrant".^[272] In response to requests by various intelligence agencies, the United States Foreign Intelligence Surveillance Court permitted an expansion of powers by the U.S. government in seeking, obtaining, and sharing information on U.S. citizens as well as non-U.S. people from around the world.^[273]

Hate crimes

See also:

Islamophobic incidents and Persecution of Muslims

Six days after the attacks, President Bush made a public appearance at Washington, D.C.'s largest Islamic Center and acknowledged the "incredibly valuable contribution" that millions of American Muslims made to their country and called for them "to be treated with respect".^[274] Numerous incidents of harassment and hate crimes against Muslims and South Asians were reported in the days following the attacks.^{[275][276][277]}

Sikh faith, which are stereotypically associated with Muslims. There were reports of attacks on mosques and other religious buildings (including the firebombing of a Hindu temple), and assaults on individuals, including one murder: Balbir Singh Sodhi, a Sikh mistaken for a Muslim, who was fatally shot on September 15, 2001, in Mesa, Arizona.^[277] Two dozen members of Osama bin Laden's family were urgently evacuated out of the country on a private charter plane under FBI supervision three days after the attacks.^[278]

According to an academic study, people perceived to be Middle Eastern were as likely to be victims of hate crimes as followers of Islam during this time. The study also found a similar increase in hate crimes against people who may have been perceived as Muslims, Arabs, and others thought to be of Middle Eastern origin.^[279] A report by the South Asian American advocacy group known as South Asian Americans Leading Together documented media coverage of 645 bias incidents against Americans of South Asian or Middle Eastern descent between September 11 and 17, 2001. Various crimes such as vandalism, arson, assault, shootings, harassment, and threats in numerous places were documented.^[280][281] Women wearing hijab were also targeted.^[282]

Discrimination and racial profiling

Further information: Detentions following the September 11 attacks, Islamophobia in the United States, and Flying while Muslim

See also: Airport racial profiling in the United States

A poll of Arab-Americans, conducted in May 2002, found that 20% had personally experienced discrimination since September 11. A July 2002 poll of Muslim Americans found that 48% believed their lives had changed for the worse since September 11, and 57% had experienced an act of bias or discrimination.^[282]

Following the September 11 attacks, many Pakistani Americans identified themselves as Indians to avoid potential discrimination and obtain jobs (Pakistan was created as a result of the partition of India in 1947).^[283]

By May 2002, there were 488 complaints of

employment discrimination reported to the U.S. Equal Employment Opportunity Commission (EEOC). 301 of those were complaints from people fired from their jobs. Similarly, by June 2002, the U.S. Department of Transportation (DOT) had investigated 111 September 11th-related complaints from airline passengers purporting that their religious or ethnic appearance caused them to be singled out at security screenings. DOT investigated an additional 31 complaints from people who alleged they were completely blocked from boarding aeroplanes on the same grounds.^[282]

Muslim American response

See also:

Muslim attitudes towards terrorism and Peace in Islamic philosophy

Muslim organizations in the United States were swift to condemn the attacks and called "upon

Council on American-Islamic Relations, Islamic Circle of North America, and the Shari'a Scholars Association of North America. Along with monetary donations, many Islamic organizations launched blood drives and provided medical assistance, food, and shelter for victims.^{[285][286][287]}

Interfaith efforts

Curiosity about Islam increased after the attacks. As a result, many mosques and Islamic centres began holding open houses and participating in outreach efforts to educate non-Muslims about the faith. In the first 10 years after the attacks, interfaith community service increased from 8 to 20 percent and the percentage of U.S. congregations involved in interfaith worship doubled from 7 to 14 percent.^[288]

International reactions

The attacks were denounced by mass media and governments worldwide. Across the globe, nations offered pro-American support and solidarity.^[289] Leaders in most Middle Eastern countries, as well as Libya and Afghanistan, condemned the attacks. Iraq was a notable exception, with an immediate official statement that "the American cowboys are reaping the fruit of their crimes against humanity".^[290] The government of Saudi Arabia officially condemned the attacks, but privately many Saudis favored bin Laden's cause.^[291][292]

Although

Palestinian Authority (PA) president Yasser Arafat also condemned the attacks, there were reports of celebrations of disputed size in the West Bank, Gaza Strip, and East Jerusalem.^[293][294] Palestinian leaders discredited news broadcasters that justified the attacks or showed celebrations,^[295] and the Authority claimed such celebrations do not represent the Palestinians' sentiment, adding that it would not allow "a few kids" to "smear the real face of the Palestinians".^[296][297] Footage by CNN^[vague] and other news outlets were suggested by a report originating at a Brazilian university to be from 1991; this was later proven to be a false accusation, resulting in a statement being issued by CNN.^[298][299] As in the United States, the aftermath of the attacks saw tensions increase in other countries between Muslims and non-Muslims.^[300]

United Nations Security Council Resolution 1368 condemned the attacks and expressed readiness to take all necessary steps to respond and combat all forms of terrorism in accordance with their Charter.^[301] Numerous countries introduced anti-terrorism legislation and froze bank accounts they suspected of Al-Qaeda ties.^[302][303] Law enforcement and intelligence agencies in a number of countries arrested alleged terrorists.^[304][305]

British Prime Minister Tony Blair said Britain stood "shoulder to shoulder" with the United States.^[306] A few days later, Blair flew to Washington, D.C., to affirm British solidarity with the United States. In a speech to Congress nine days after the attacks, which Blair attended as a guest, President Bush declared "America has no truer friend than Great Britain".^[307] Subsequently, Prime Minister Blair embarked on two months of diplomacy to rally international support for military action; he held 54 meetings with world leaders and travelled more than 40,000 miles (60,000 km).^[308]

The U.S. set up the

illegal enemy combatants". The legitimacy of these detentions has been questioned by the European Union and human rights organizations.^{[309][310][311]}

On September 25, 2001,

fifth president, Mohammad Khatami, meeting British Foreign Secretary Jack Straw, said: "Iran fully understands the feelings of the Americans about the terrorist attacks in New York and Washington on September 11". He said although the American administrations had been at best indifferent about terrorist operations in Iran (since 1979), the Iranians felt differently and had expressed their sympathetic feelings with bereaved Americans in the tragic incidents in the two cities. He also stated that "Nations should not be punished in place of terrorists".^[312]

According to

Friday prayers" temporarily.^[318]

In September 2001, shortly after the attacks, some fans of AEK Athens burned an Israeli flag and unsuccessfully tried to burn an American flag. Though the American flag did not catch fire, the fans booed during a moment of silence for victims of the attacks.^[319]

Military operations

Further information:

US invasion of Afghanistan

Events leading up to the Iraq War
14 July Revolution 1958 Iraqi–Kurdish conflict 1961–1991 17 July Revolution 1968 Iranian Revolution 1978–1979 Ba'ath Party Purge 1979 Iran–Iraq War 1980–1988 Iraqgate 1982–c.1990 Iraqi invasion of Kuwait 1990 Gulf War 1990–1991 Sanctions against Iraq 1990–2003 Iraqi uprisings 1991 Iraqi no-fly zones conflict 1991–2003 Iraq disarmament crisis 1991–2003 Arms-to-Iraq affair 1992–1996 September 11 attacks 2001 U.S. anthrax attacks 2001 U.S. invasion of Afghanistan 2001 Alleged Prague connection 2001 Iraq Resolution 2002 Wood Green ricin plot 2003 Colin Powell's UN presentation 2003
v t e

At 2:40 p.m. on September 11, Secretary of Defense Donald Rumsfeld was issuing rapid orders to his aides to look for evidence of Iraqi involvement. According to notes taken by senior policy official Stephen Cambone, Rumsfeld asked for, "Best info fast. Judge whether they are good enough to hit S.H. [Saddam Hussein] at the same time. Not only UBL" [Osama bin Laden].^[320] Cambone's notes quoted Rumsfeld as saying, "Need to move swiftly – Near term target needs – go massive – sweep it all up. Things related and not".^[321][322]

In a meeting at

Saddam Hussein's support for terrorism".^[324] At the time, as many as seven in ten Americans believed the Iraqi president played a role in the 9/11 attacks.^[325] Three years later, Bush conceded that he had not.^[326]

The NATO council declared that the terrorist attacks on the United States were an attack on all NATO nations that satisfied Article 5 of the NATO charter. This marked the first invocation of Article 5, which had been written during the Cold War with an attack by the Soviet Union in mind.^[327] Australian Prime Minister John Howard, who was in Washington, D.C., during the attacks, invoked Article IV of the ANZUS treaty.^[328] The Bush administration announced a war on terror, with the stated goals of bringing bin Laden and Al-Qaeda to justice and preventing the emergence of other terrorist networks.^[329] These goals would be accomplished by imposing economic and military sanctions against states harbouring terrorists, and increasing global surveillance and intelligence sharing.^[330]

On September 14, 2001, the U.S. Congress passed the Authorization for the use of Military Force Against Terrorists, which grants the President the authority to use all "necessary and appropriate force" against those whom he determined "planned, authorized, committed or aided" the September 11 attacks or who harboured said persons or groups. It is still in effect to this day.^[331]

On October 7, 2001, the

Special Forces.^{[citation needed]} This eventually led to the overthrow of the Taliban's rule of Afghanistan with the Fall of Kandahar on December 7, 2001, by U.S.-led coalition forces.^[332]

Al-Qaeda leader Osama bin Laden, who went into hiding in the

White Mountains, was targeted by U.S. coalition forces in the Battle of Tora Bora,^[333] but he escaped across the Pakistani border and would remain out of sight for almost ten years.^[333] In an interview with Tayseer Allouni on 21 October 2001, Bin Laden stated:

"The events proved the extent of terrorism that America exercises in the world. Bush stated that the world has to be divided in two: Bush and his supporters, and any country that doesn't get into the global crusade is with the terrorists. What terrorism is clearer than this? Many governments were forced to support this "new terrorism.".. America wouldn't live in security until we live it truly in Palestine. This showed the reality of America, which puts Israel's interest above its own people's interest. America won't get out of this crisis until it gets out of the Arabian Peninsula, and until it stops its support of Israel.^[334]

The Philippines and Indonesia, among other nations with their internal conflicts with Islamic terrorism, also increased their military readiness.^[335][336] The military forces of the United States of America and the Islamic Republic of Iran cooperated to overthrow the Taliban regime, which had had conflicts with the government of Iran.^{[318][337][338][339]}Iran's Quds Force helped U.S. forces and Afghan rebels in the 2001 uprising in Herat.^{[340][341][342]}

Aftermath

Main article: Aftermath of the September 11 attacks

See also: Post-9/11

Health issues

Main article: Health effects arising from the September 11 attacks

Hundreds of thousands of tons of toxic debris containing more than 2,500 contaminants and known carcinogens were spread across Lower Manhattan when the Twin Towers' collapsed.

Environmental Protection Agency (EPA) to issue reassuring statements regarding air quality in the aftermath of the attacks, citing national security, but the EPA did not determine that air quality had returned to pre-September 11 levels until June 2002.^[349]

Health effects extended to residents, students, and office workers of Lower Manhattan and nearby Chinatown.^[350] Several deaths have been linked to the toxic dust, and victims' names were included in the World Trade Center memorial.^[351] Approximately 18,000 people have been estimated to have developed illnesses as a result of the toxic dust.^[352] There is also scientific speculation that exposure to various toxic products in the air may have negative effects on fetal development.^{[citation needed]} A study of rescue workers released in April 2010 found that all those studied had impaired lung functions and that 30%–40% were reporting little or no improvement in persistent symptoms that started within the first year of the attack.^[353]

Years after the attacks, legal disputes over the costs of illnesses related to the attacks were still in the court system. On October 17, 2006, a federal judge rejected New York City's refusal to pay for health costs for rescue workers, allowing for the possibility of numerous suits against the city.^[354] Government officials have been faulted for urging the public to return to lower Manhattan in the weeks shortly after the attacks. Christine Todd Whitman, administrator of the EPA in the attacks' aftermath, was heavily criticized by a U.S. District Judge for incorrectly saying that the area was environmentally safe.^[355] Mayor Giuliani was criticized for urging financial industry personnel to return quickly to the greater Wall Street area.^[356]

On December 22, 2010, the

James L. Zadroga 9/11 Health and Compensation Act, which President Barack Obama signed into law on January 2, 2011. It allocated $4.2 billion to create the World Trade Center Health Program, which provides testing and treatment for people suffering from long-term health problems related to the 9/11 attacks.^[357][358] The WTC Health Program replaced preexisting 9/11-related health programs such as the Medical Monitoring and Treatment Program and the WTC Environmental Health Center program.^[358]

In 2020, the NYPD confirmed that 247 NYPD police officers had died due to 9/11-related illnesses. In September 2022, the FDNY confirmed that the total number of firefighters who died due to 9/11-related illnesses was 299. Both agencies believe that the death toll will rise dramatically in the coming years. The Port Authority of New York and New Jersey Police Department (PAPD), the law enforcement agency with jurisdiction over the World Trade Center due to the Port Authority of New York and New Jersey owning the site confirmed that four of its police officers have died of 9/11-related illnesses. The chief of the PAPD at the time, Joseph Morris, made sure that industrial-grade respirators were provided to all PAPD police officers within 48 hours and decided that the same 30 to 40 police officers would be stationed at the World Trade Center pile, drastically lowering the number of total PAPD personnel who would be exposed to the air. The FDNY and NYPD had rotated hundreds, if not thousands, of different personnel from all over New York City to the pile, which exposed many of them to dust that would give them cancer or other diseases years or decades later. Also, they were not given adequate respirators and breathing equipment that could have prevented future diseases.^{[359][360][361][362]}

Economic

Main article: Economic effects of the September 11 attacks

debt

increases in the seven years following the attacks from 2001 to 2008

The attacks had a significant economic impact on the United States and world markets.^[363][364] The stock exchanges did not open on September 11 and remained closed until September 17. Reopening, the Dow Jones Industrial Average (DJIA) fell 684 points, or 7.1%, to 8921, a record-setting one-day point decline.^[365] By the end of the week, the DJIA had fallen 1,369.7 points (14.3%), at the time its largest one-week point drop in history. In 2001 dollars, U.S. stocks lost $1.4 trillion in valuation for the week.^[366]

In New York City, about 430,000 job months and $2.8 billion in wages were lost in the first three months after the attacks. The economic effects were mainly on the economy's export sectors.^{[367][368][369]} The city's GDP was estimated to have declined by $27.3 billion for the last three months of 2001 and all of 2002. The U.S. government provided $11.2 billion in immediate assistance to the Government of New York City in September 2001, and $10.5 billion in early 2002 for economic development and infrastructure needs.^[370]

Also hurt were small businesses in Lower Manhattan near the World Trade Center (18,000 of which were destroyed or displaced), resulting in lost jobs and wages. Assistance was provided by Small Business Administration loans; federal government Community Development Block Grants; and Economic Injury Disaster Loans.^[370] Some 31,900,000 square feet (2,960,000 m²) of Lower Manhattan office space was damaged or destroyed.^[371] Many wondered whether these jobs would return, and if the damaged tax base would recover.^[372] Studies of 9/11's economic effects show the Manhattan office real-estate market and office employment were less affected than first feared, because of the financial services industry's need for face-to-face interaction.^[373][374]

North American air space was closed for several days after the attacks and air travel decreased upon its reopening, leading to a nearly 20% cutback in air travel capacity, and exacerbating financial problems in the struggling U.S. airline industry.^[375]

The September 11 attacks also led to the U.S.

wars in Afghanistan and Iraq,^[376] as well as additional homeland security spending, totaling at least $5 trillion.^[377]

Effects in Afghanistan

Further information:

Aftermath of the War in Afghanistan (2001–2021), and Killing of Ayman al-Zawahiri

If Americans are clamouring to bomb Afghanistan back to the Stone Age, they ought to know that this nation does not have so far to go. This is a post-apocalyptic place of felled cities, parched land and downtrodden people.

— Barry Bearak, The New York Times, September 13, 2001^[378]

Most of the

two decades of conflict and the humanitarian crisis attached to it.^[378]

All United Nations expatriates had left Afghanistan after the attacks and no national or international aid workers were at their post. Workers were instead preparing in bordering countries like Pakistan, China and Uzbekistan to prevent a potential "humanitarian catastrophe", amid a critically low food stock for the Afghan population.[382] The World Food Programme stopped importing wheat to Afghanistan on September 12 due to security risks.^[383] The Wall Street Journal suggested the creation of a buffer zone in an inevitable war, similarly as in the Bosnian War.^[384]

From left to right: U.S. soldiers engaged in the War on Terror in Afghanistan in May 2006 • Army Major General Chris Donahue left Afghanistan as the final American soldier on August 30, 2021

Approximately one month after the attacks, the United States led a broad coalition of international forces to overthrow the Taliban regime from Afghanistan for their harboring of Al-Qaeda.^[380] Though Pakistani authorities were initially reluctant to align themselves with the United States against the Taliban, they permitted the coalition access to their military bases, and arrested and handed over to the U.S. over 600 suspected Al-Qaeda members.^[385][386]

In a speech by the Nizari Ismaili Imam at the Nobel Institute in 2005, Aga Khan IV stated that the "9/11 attack on the United States was a direct consequence of the international community ignoring the human tragedy that was Afghanistan at that time".^[387]

In 2011, the U.S. and NATO under

withdrew all troops from Afghanistan completing the withdrawal of all regular U.S. troops on August 30, 2021, 12 days before the 20th anniversary of the September 11 attacks,^{[150][388][389]} The withdrawal marked the end of the 2001–2021 War in Afghanistan. Biden said that after nearly 20 years of war, it was clear that the U.S. military could not transform Afghanistan into a modern democracy.^[390]

The second emir of Al-Qaeda, Ayman al-Zawahiri, a close associate of bin Laden, was killed in a U.S. drone strike at his home in Kabul, Afghanistan on July 31, 2022.^[391]

Cultural influence

Main article: Cultural influence of the September 11 attacks

Further information:

Entertainment affected by the September 11 attacks, and Osama bin Laden in popular culture

See also: Osama bin Laden (elephant)

The impact of 9/11 extends beyond geopolitics and into society and culture in general. Immediate responses to 9/11 included greater focus on home life and time spent with family, higher church attendance, and increased expressions of patriotism such as the flying of American flags.

film, music, literature, and humour. Already-running television shows as well as programs developed after 9/11 have reflected post-9/11 cultural concerns.^[393]

9/11 conspiracy theories have become a social phenomenon, despite a lack of support from expert scientists, engineers, and historians.^[394] 9/11 has also had a major impact on the religious faith of many individuals; for some it strengthened, to find consolation to cope with the loss of loved ones and overcome their grief; others started to question their faith or lose it entirely because they could not reconcile it with their view of religion.^[395][396]

The culture of America, after the attacks, is noted for heightened security and an increased demand thereof, as well as paranoia and anxiety regarding future terrorist attacks against most of the nation. Psychologists have also confirmed that there has been an increased amount of national anxiety in commercial air travel.^[397] Anti-Muslim hate crimes rose nearly ten-fold in 2001 and have subsequently remained "roughly five times higher than the pre-9/11 rate".^[398]

Government policies towards terrorism

Further information: War on terror, Anti-terrorism legislation, Airport security repercussions due to the September 11 attacks, and Legal issues related to the September 11 attacks

See also: Senate Intelligence Committee report on CIA torture

As a result of the attacks, many governments across the world passed legislation to combat terrorism.

Canadian Anti-Terrorism Act, their first anti-terrorism law.^[402] The United Kingdom passed the Anti-terrorism, Crime and Security Act 2001 and the Prevention of Terrorism Act 2005.^[403][404] New Zealand enacted the Terrorism Suppression Act 2002.^[405]

In the United States, the

sky marshals

to flights.

Further, the

Jim Sensenbrenner,(R- Wisconsin) who introduced the Patriot Act in 2001, said that the NSA overstepped its bounds.^[407][408]

U.S. law prohibits the use of torture, yet such human rights violations occurred during the War on Terror under the euphemism "enhanced interrogation".^[412][413] In 2005, The Washington Post and Human Rights Watch (HRW) published revelations concerning CIA flights and "black sites", covert prisons operated by the CIA.^[414][415] The term "torture by proxy" is used by some critics to describe situations in which the CIA and other U.S. agencies have transferred suspected terrorists to countries known to employ torture.^[416][417]

Legal proceedings

Main articles: Trials related to the September 11 attacks and United States v. Khalid Sheikh Mohammed

As all 19 hijackers died in the attacks, they were never prosecuted. Osama bin Laden was never formally indicted but was after a

Mustafa Ahmad al Hawsawi remains unresolved. Khalid Sheikh Mohammed was arrested on March 1, 2003, in Rawalpindi, Pakistan, by Pakistani security officials working with the CIA. He was then held at multiple CIA secret prisons and Guantanamo Bay, where he was interrogated and tortured with methods including waterboarding.^[419][420] In 2003, Mustafa al-Hawsawi and Abd al-Aziz Ali were arrested and transferred to US custody. Both would later be accused of providing money and travel assistance to the hijackers.^[421] During U.S. hearings at Guantanamo Bay in March 2007, Mohammed again confessed his responsibility for the attacks, stating he "was responsible for the 9/11 operation from A to Z" and that his statement was not made under duress.^[42][422] In January 2023, the US government opened up about a potential plea deal,^[423] with Biden giving up on the effort in September that year.^[424]

To date, only peripheral persons have thus been convicted for charges in connection with the attacks. These include:

• Zacarias Moussaoui who was indicted in December 2001 and sentenced to life in prison without the possibility of parole in May 2006 by a U.S. federal jury
• Mounir El Motassadeq who was first convicted in February 2003 by a Federal Court of Justice in Germany and was deported to Morocco in October 2018 after serving his sentence^[425]
• Abu Dahdah who was arrested in November 2001, sentenced by a Spanish High Court and released from prison in May 2013.^[426]

Investigations

FBI

Further information: Hijackers in the September 11 attacks

Immediately after the attacks, the Federal Bureau of Investigation started PENTTBOM, the largest criminal inquiry in United States history. At its height, more than half of the FBI's agents worked on the investigation and followed a half-million leads.^[427] The FBI concluded that there was "clear and irrefutable" evidence linking Al-Qaeda and bin Laden to the attacks.^[428]

The FBI quickly identified the hijackers, including leader Mohamed Atta, when his luggage was discovered at Boston's Logan Airport. Atta had been forced to check two of his three bags due to space limitations on the 19-seat commuter flight he took to Boston. Due to a new policy instituted to prevent flight delays, the luggage failed to make it aboard American Airlines Flight 11 as planned. The luggage contained the hijackers' names, assignments, and Al-Qaeda connections. "It had all these Arab-language [sic] papers that amounted to the Rosetta stone of the investigation", said one FBI agent.^[429] Within hours of the attacks, the FBI released the names and in many cases the personal details of the suspected pilots and hijackers.^[430][431] Abu Jandal, who served as bin Laden's chief bodyguard for years, confirmed the identity of seven hijackers as Al-Qaeda members during interrogations with the FBI on September 17. He had been jailed in a Yemeni prison since 2000.^[432][433] On September 27, 2001, photos of all 19 hijackers were released, along with information about possible nationalities and aliases.^[434] Fifteen of the men were from Saudi Arabia, two were from the United Arab Emirates, one was from Egypt, and one was from Lebanon.^[435]

By midday, the U.S. National Security Agency and German intelligence agencies had intercepted communications pointing to Osama bin Laden.^[436] Two of the hijackers were known to have traveled with a bin Laden associate to Malaysia in 2000^[437] and hijacker Mohamed Atta had previously gone to Afghanistan.^[438] He and others were part of a terrorist cell in Hamburg.^[439] One of the members of the Hamburg cell in Germany was discovered to have been in communication with Khalid Sheikh Mohammed who was identified as a member of Al-Qaeda.^[440]

Authorities in the United States and the United Kingdom also obtained electronic intercepts, including telephone conversations and electronic bank transfers, which indicated that Mohammed Atef, a bin Laden deputy, was a key figure in the planning of the 9/11 attacks. Intercepts were also obtained that revealed conversations that took place days before September 11 between bin Laden and an associate in Pakistan. In those conversations, the two referred to "an incident that would take place in America on, or around, September 11" and they discussed potential repercussions. In another conversation with an associate in Afghanistan, bin Laden discussed the "scale and effects of a forthcoming operation". These conversations did not specifically mention the World Trade Center, the Pentagon, or other specifics.^[441]

Origins of the 19 hijackers

Nationality	Number
Saudi Arabia	15
United Arab Emirates	2
Egypt	1
Lebanon	1

In their annual violent crime index for the year 2001, the FBI recorded the deaths from the attacks as murder, in separate tables so as not to mix them with other reported crimes for that year.^[442] In a disclaimer, the FBI stated that "the number of deaths is so great that combining it with the traditional crime statistics will have an outlier effect that falsely skews all types of measurements in the program's analyses".^[443] New York City also did not include the deaths in their annual crime statistics for 2001.^[444]

CIA

Further information: September 11 intelligence before the attacks

In 2004, John L. Helgerson, the Inspector General of the Central Intelligence Agency (CIA), conducted an internal review of the agency's pre-9/11 performance and was harshly critical of senior CIA officials for not doing everything possible to confront terrorism.^[445] According to Philip Giraldi in The American Conservative, Helgerson criticized their failure to stop two of the 9/11 hijackers, Nawaf al-Hazmi and Khalid al-Mihdhar, as they entered the United States and their failure to share information on the two men with the FBI.^[446]

In May 2007, senators from both major U.S. political parties (the Republican and Democratic party) drafted legislation to make the review public. One of the backers, Senator Ron Wyden said, "The American people have a right to know what the Central Intelligence Agency was doing in those critical months before 9/11".^[447] The report was released in 2009 by President Barack Obama.^[445]

Congressional inquiry

Main article: Joint Inquiry into Intelligence Community Activities before and after the Terrorist Attacks of September 11, 2001

In February 2002, the

John Brennan said that he believes 28 redacted pages of a congressional inquiry into 9/11 will soon be made public, and that they will prove that the government of Saudi Arabia had no involvement in the September 11 attacks.^[457]

In September 2016, Congress passed the

alleged role in the attacks.^{[458][459][460]}

9/11 Commission

Main articles: 9/11 Commission and 9/11 Commission Report

See also: Criticism of the 9/11 Commission

The National Commission on Terrorist Attacks Upon the United States, popularly known as the 9/11 Commission, chaired by Thomas Kean, governor of New Jersey from 1982 to 1990,^[m] was formed in late 2002 to prepare a thorough account of the circumstances surrounding the attacks, including preparedness for and the immediate response to the attacks.^[465] On July 22, 2004, the commission issued the 9/11 Commission Report, a 585-page report based on its investigations and interviews. The report detailed the events leading up to the September 11 attacks, concluding that they were carried out by Al-Qaeda. The commission also examined how security and intelligence agencies were inadequately coordinated to prevent the attacks.

According to the report, "We believe the 9/11 attacks revealed four kinds of failures: in imagination, policy, capabilities, and management".^[466] The commission made numerous recommendations on how to prevent future attacks, and in 2011 was dismayed that several of its recommendations had yet to be implemented.^[467]

National Institute of Standards and Technology

Main article: NIST World Trade Center Disaster Investigation

See also: 7 World Trade Center § 9/11 and collapse

The U.S. National Institute of Standards and Technology (NIST) investigated the collapses of the Twin Towers and 7 WTC. The investigations examined why the buildings collapsed and what fire protection measures were in place, and evaluated how fire protection systems might be improved in future construction.^[468] The investigation into the collapse of 1 WTC and 2 WTC was concluded in October 2005 and that of 7 WTC was completed in August 2008.^[469]

NIST found that the fireproofing on the Twin Towers' steel infrastructures was blown off by the initial impact of the planes and that had this not occurred, the towers likely would have remained standing.^[470] A 2007 study of the north tower's collapse published by researchers of Purdue University determined that since the plane's impact had stripped off much of the structure's thermal insulation, the heat from a typical office fire would have softened and weakened the exposed girders and columns enough to initiate the collapse regardless of the number of columns cut or damaged by the impact.^[471][472]

The director of the original investigation stated that "the towers did amazingly well. The terrorist aircraft didn't bring the buildings down; it was the fire that followed. It was proven that you could take out two-thirds of the columns in a tower and the building would still stand".^[473] The fires weakened the trusses supporting the floors, making the floors sag. The sagging floors pulled on the exterior steel columns causing the exterior columns to bow inward.

With the damage to the core columns, the buckling exterior columns could no longer support the buildings, causing them to collapse. Additionally, the report found the towers' stairwells were not adequately reinforced to provide adequate emergency escape for people above the impact zones.^[474] NIST concluded that uncontrolled fires in 7 WTC caused floor beams and girders to heat and subsequently "caused a critical support column to fail, initiating a fire-induced progressive collapse that brought the building down".^[469]

Alleged Saudi government role

Main article:

Saudi Arabia and state-sponsored terrorism, and The 28 pages

In July 2016, the Obama administration released a document compiled by U.S. investigators Dana Lesemann and Michael Jacobson, known as "File 17",[475] which contains a list naming three dozen people, including the suspected Saudi intelligence officers attached to Saudi Arabia's embassy in Washington, D.C.,^[476] which connects Saudi Arabia to the hijackers.^[477][478]

In September 2016, Congress passed the Justice Against Sponsors of Terrorism Act.^[479][480] The practical effect of the legislation was to allow the continuation of a longstanding civil lawsuit brought by families of victims of the September 11 attacks against Saudi Arabia for its government's alleged role in the attacks.^[481] In March 2018, a U.S. judge formally allowed a suit to move forward against the government of Saudi Arabia brought by 9/11 survivors and victims' families.^[479]

In 2022, the families of some 9/11 victims obtained two videos and a notepad seized from Saudi national Omar al-Bayoumi by the British courts. The first video showed him hosting a party in San Diego for Nawaf al-Hazmi and Khalid al-Mihdhar, the first two hijackers to arrive in the U.S. The other video showed al-Bayoumi greeting the cleric Anwar al-Awlaki, who was blamed for radicalizing Americans and later killed in a CIA drone strike. The notepad depicted a hand-drawn aeroplane and some mathematical equations that, according to a pilot's court statement, might have been used to calculate the rate of descent to get to a target. According to a 2017 FBI memo, from the late 1990s up until the 9/11 attack, al-Bayoumi was a paid cooptee of the Saudi General Intelligence Presidency. As of April 2022^[update] he is believed to be living in Saudi Arabia, which has denied any involvement in 9/11.^[482]

Rebuilding and memorials

Reconstruction

Main articles: Rescue and recovery effort after the September 11 attacks on the World Trade Center and Construction of One World Trade Center

Further information: World Trade Center (2001–present) and World Trade Center site

On the day of the attacks, New York City mayor Rudy Giuliani stated: "We will rebuild. We're going to come out of this stronger than before, politically stronger, economically stronger. The skyline will be made whole again".^[483]

Within hours of the attack, a substantial search and rescue operation was launched. After months of around-the-clock operations, the World Trade Center site was cleared by the end of May 2002.

World Trade Center PATH station opened in late 2003 and construction of the new 7 World Trade Center was completed in 2006. Work on rebuilding the main World Trade Center site was delayed until late 2006 when leaseholder Larry Silverstein and the Port Authority of New York and New Jersey agreed on financing.^[486] The construction of One World Trade Center began on April 27, 2006, and reached its full height on May 20, 2013. The spire was installed atop the building at that date, putting One WTC's height at 1,776 feet (541 m) and thus claiming the title of the tallest building in the Western Hemisphere.^[487][488] One WTC finished construction and opened on November 3, 2014.^{[488][489][490]}

On the World Trade Center site, three more office towers were to be built one block east of where the original towers stood.

Ronald O. Perelman Performing Arts Center in September 2023.^[495] With construction beginning in 2008,^[496] 2 World Trade Center remains as of 2023 unfinished.^[497] Construction of a 5 World Trade Center is planned to begin in 2024 and be finished by 2029.^[498][499]

Christopher O. Ward, Port Authority of New York and New Jersey Executive Director from 2008 to 2011, is a survivor of the attacks and is credited with getting the construction of the 9/11 site back on track.^[500]

Memorials

Main article: Memorials and services for the September 11 attacks

National September 11 Memorial and Museum in Lower Manhattan

, August 2016

In the days immediately following the attacks, many memorials and vigils were held around the world, and photographs of the dead and missing were posted around Ground Zero. A witness described being unable to "get away from faces of innocent victims who were killed. Their pictures are everywhere, on phone booths, street lights, and walls of subway stations. Everything reminded me of a huge funeral, people were quiet and sad, but also very nice. Before, New York gave me a cold feeling; now people were reaching out to help each other".^[501] President Bush proclaimed Friday, September 14, 2001 as Patriot Day.^[502]

One of the first memorials was the Tribute in Light, an installation of 88 searchlights at the footprints of the World Trade Center towers.^[503] In New York City, the World Trade Center Site Memorial Competition was held to design an appropriate memorial on the site.^[504] The winning design, Reflecting Absence, was selected in August 2006, and consists of a pair of reflecting pools in the footprints of the towers, surrounded by a list of the victims' names in an underground memorial space.^[505] The memorial was completed on September 11, 2011;^[506] a museum also opened on site on May 21, 2014.^[507]

9/11 Memorial.^[508]

National 9/11 Pentagon Memorial in Arlington County, Virginia

, September 2008

In Arlington County, the Pentagon Memorial was completed and opened to the public on the seventh anniversary of the attacks in 2008.^[509][510] It consists of a landscaped park with 184 benches facing the Pentagon.^[511] When the Pentagon was repaired in 2001–2002, a private chapel and indoor memorial were included, located at the spot where Flight 77 crashed into the building.^[512]

In Shanksville, a concrete-and-glass visitor center was opened on September 10, 2015,^[513] situated on a hill overlooking the crash site and the white marble Wall of Names.^[514] An observation platform at the visitor centre and the white marble wall are both aligned beneath the path of Flight 93.^[514][515] A temporary memorial is located 500 yards (457 m) from the crash site.^[516] New York City firefighters donated a cross made of steel from the World Trade Center and mounted on top of a platform shaped like the Pentagon.^[517] It was installed outside the firehouse on August 25, 2008.^[518] Many other permanent memorials are elsewhere. Scholarships and charities have been established by the victims' families and by many other organizations and private figures.^[519]

On every anniversary in New York City, the names of the victims who died there are read out against a background of sombre music. The President of the United States attends a memorial service at the Pentagon,^[520] and asks Americans to observe Patriot Day with a moment of silence. Smaller services are held in Shanksville, Pennsylvania, which are usually attended by the First Lady. In September 2023, President Joe Biden did not attend services in the affected areas, instead marking the day in Anchorage, Alaska, the first US President to do so since the attacks.^{[521][522][523]}

See also

• 9/11 Commission
• 9/11 Commission Report
• Air France Flight 8969
• Bojinka plot
• Delta 1989 and Korean 085, two other flights that were falsely suspected of being hijacked as part of the September 11 attacks
• List of cultural references to the September 11 attacks
• Khobar Towers bombing
• List of attacks on U.S. territory
• List of aviation incidents involving terrorism
• List of deadliest terrorist attacks in the United States
• List of Islamist terrorist attacks
• List of major terrorist incidents
• List of terrorist incidents in 2001
• List of terrorist incidents in New York City
  • Outline of the September 11 attacks
• Timeline of al-Qaeda attacks
• Timeline of the September 11 attacks
• USS Cole bombing
• 1993 World Trade Center bombing
• 1998 United States embassy bombing
• 2006 transatlantic aircraft plot
• 2007 John F. Kennedy International Airport attack plot
• 2009 Bronx terrorism plot
• 2010 transatlantic aircraft bomb plot
• 2023 Israel–Hamas war

References

Notes

1. ^ Other, secondary attack locations include the airspaces of Massachusetts, New Jersey, Ohio, Kentucky and West Virginia.
2. ^ The hijackers began their first attack at around 08:13 a.m., when a group of five took control of American Airlines Flight 11, injuring two people and murdering one before forcing their way into the cockpit.
3. ^ The fourth and final hijacked plane of the attacks crashed in a Pennsylvania field at 10:03 a.m., which concluded the attacks since all the attackers were now dead and all of the hijacked planes were destroyed. However, the attackers' damage continued as the North Tower kept burning for an additional 25 minutes until it ultimately collapsed by 10:28 a.m.
4. ^ Sources vary regarding the number of injuries―some say 6,000^[1] while others go as high as 25,000.^[2]
5. numerical dating convention; the slash
   is not pronounced.
6. ^ The exact time is disputed. The 9/11 Commission Report states that Flight 11 struck the North Tower at 08:46:40 a.m.,^[3] NIST reports 08:46:30 a.m.,^[4] and some other sources claim 08:46:26 a.m.^[5]
7. ^ ^{a b c} The exact time is disputed. The 9/11 Commission Report states that Flight 175 struck the South Tower at 09:03:11 a.m.,^[6][7] NIST reports 09:02:59 a.m.,^[8] and some other sources claim 09:03:02 a.m.^[9] In any case, the 16-minute gap between each impact is rounded to 17.^[10]
8. ^ ^{a b} While NIST and the 9/11 Commission give differing accounts of the exact second of the North Tower's collapse initiation, with NIST placing it at 10:28:22 a.m.^[11][12] and the commission at 10:28:25 a.m.,^[13] it is generally accepted that Flight 11 did not strike the North Tower any sooner than 8:46:26 a.m.,^[5] so the time it took for the North Tower to collapse was just shy of 102 minutes either way.
9. ^ NIST and the 9/11 Commission both state that the collapse began at 9:58:59 a.m., which is rounded to 9:59^{[148]: 84 [147]: 322} for simplicity. If the commission's claim that the South Tower was struck at 9:03:11 is to be believed, then the collapse began 55 minutes and 48 seconds after the crash, not 56 minutes.
10. ^ The exact time of the North Tower's collapse initiation is disputed, with NIST dubbing the moment it began to collapse as being 10:28:22 a.m.^[149] and the 9/11 Commission recording the time as 10:28:25.^[150]: 329
11. ^ The massacre at Camp Speicher―often described as the second deadliest act of terrorism in history after 9/11―is said to have killed between 1,095 and 1,700 people.^[161] The upper estimate would tie it with the attack on the World Trade Center's North Tower, but until the true death toll of the massacre becomes known, then the hijacking and crash of Flight 11 was the deadliest act of terrorism on record.
12. ^ President Barack Obama announced his death on May 1. At the time of the raid, it was early morning of May 2 in Pakistan and late afternoon of May 1 in the U.S.
13. ^ Former Secretary of State Henry Kissinger was initially appointed to head the commission^[461] but resigned only weeks after being appointed, to avoid conflicts of interest.^[462] Former U.S. Senator George Mitchell was originally appointed as the vice chairman, but he stepped down on December 10, 2002, not wanting to sever ties to his law firm.^[463] On December 15, 2002, Bush appointed former New Jersey Governor Tom Kean to head the commission.^[464]

Citations

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41. ^ Leonard, Tom; Spillius, Alex (October 10, 2008). "Alleged 9/11 mastermind wants to confess to plot". The Daily Telegraph. London. Archived from the original on January 10, 2022. Retrieved September 3, 2011.
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43. ^ 9/11 Commission Report (2004), p. 147.
44. ^ "White House power grabs". The Washington Times. August 26, 2009. Archived from the original on December 5, 2019. Retrieved September 3, 2011.
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53. ^ ^{a b}
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54. ^ "Full text: bin Laden's 'letter to America'". The Guardian. November 24, 2002. Archived from the original on October 8, 2014. Retrieved January 7, 2019. The blood pouring out of Palestine must be equally revenged. You must know that the Palestinians do not cry alone; their women are not widowed alone; their sons are not orphaned alone... American people have chosen, consented to, and affirmed their support for the Israeli oppression of the Palestinians, the occupation and usurpation of their land, and its continuous killing, torture, punishment and expulsion of the Palestinians. The American people have the ability and choice to refuse the policies of their government and even to change them if they want. (b) The American people are the ones who pay the taxes that fund the planes that bomb us in Afghanistan, the tanks that strike and destroy our homes in Palestine, the armies that occupy our lands in the Arabian Gulf, and the fleets that ensure the blockade of Iraq.
55. ISBN 978-0-8157-0451-5
    . The Palestinian intifada, the fierce uprising in the fall of 2000 on the West Bank and Gaza, was a particularly powerful motivating event for.. bin Laden... The intifada's power over bin Laden's thinking about the 9/11 raid is underscored by his repeated attempts to push KSM to advance the timing of the crashes. In September of 2000, he urged KSM to tell Atta to attack immediately to respond to the Sharon visit to the holy sites in Jerusalem; Atta told bin Laden he was not ready yet. When bin Laden learned that Sharon, who had become Israel's prime minister in March 2001, was going to visit the White House early that summer, he again pressed Atta to attack immediately. And again Atta demurred, arguing he needed more time to get the plan and the team ready to go.
56. ISBN 978-1-62356-314-1
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57. ISBN 978-0-521-85911-0
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58. ^ *Plotz, David (2001) What Does Osama Bin Laden Want? Archived November 15, 2016, at the Wayback Machine, Slate
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70. ^ Summers and Swan (2011), pp. 211, 506n.
71. ^ Lawrence (2005), p. 239.
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73. ^ In his taped broadcast from January 2010, bin Laden said "Our attacks against you [the United States] will continue as long as U.S. support for Israel continues. ... The message sent to you with the attempt by the hero Nigerian Umar Farouk Abdulmutallab is a confirmation of our previous message conveyed by the heroes of September 11". Quoted from "Bin Laden: Attacks on U.S. to go on as long as it supports Israel" Archived December 16, 2016, at the Wayback Machine, in Haaretz.com
74. Arab secularism
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77. ^ In The Osama bin Laden I Know, Peter Bergen argues the attacks were part of a plan to cause the United States to increase its military and cultural presence in the Middle East, thereby forcing Muslims to confront the idea of a non-Muslim government and to eventually establish conservative Islamic governments in the region.(Bergen (2006), p. 229)
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82. ^ 9/11 Commission Report (2004), p. 149.
83. ^ 9/11 Commission Report (2004), p. 155.
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87. ^ Wright (2006), pp. 309–15.
88. ^ McDermott (2005), pp. 191–92.
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90. ^ Wright (2006), pp. 304–07.
91. ^ Wright (2006), p. 302.
92. ^ Jessee (2006), p. 371.
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99. ^ Clarke (2004), pp. 235–36.
100. ^ Wright (2006), p. 344.
101. ^ Clarke (2004), pp. 236–37.
102. ^ Clarke (2004), pp. 242–43.
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108. ^ Yitzhak (2016), p. 218.
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111. ^ Wright (2006), pp. 342–43.
112. ^ Javorsek II et al. (2015), p. 742.
113. ^ Clarke (2004), p. 238.
114. ^ ^{a b c} The 9/11 Commission Report, pp. 4–14.
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Further reading

• The 9/11 Commission Report: Final Report of the National Commission on Terrorist Attacks Upon the United States. National Commission on Terrorist Attacks. July 30, 2010.
  ISBN 978-1-61640-219-8
  .
• Atkins, Stephen E (2011). The 9/11 Encyclopedia. ABC-CLIO.
  ISBN 978-1-59884-921-9
  .
• Bolton, M. Kent (2006). U.S. National Security and Foreign Policymaking After 9/11: Present at the Re-creation. Rowman & Littlefield.
  ISBN 978-0-7425-5900-4
  .
• Caraley, Demetrios (2002). September 11, terrorist attacks, and U.S. foreign policy. Academy of Political Science.
  ISBN 978-1-884853-01-2
  .
• Chernick, Howard (2005). Resilient city: the economic impact of 9/11. Russell Sage Foundation.
  ISBN 978-0-87154-170-3
  .
• Damico, Amy M; Quay, Sara E. (2010). September 11 in Popular Culture: A Guide. Greenwood.
  ISBN 978-0-313-35505-9
  .
• Hampton, Wilborn (2003). September 11, 2001: attack on New York City. Candlewick Press.
  ISBN 978-0-7636-1949-7
  .
• Langley, Andrew (2006). September 11: Attack on America. Compass Point Books.
  ISBN 978-0-7565-1620-8
  .
• Neria, Yuval; Gross, Raz; Marshall, Randall D.; Susser, Ezra S. (2006). 9/11: mental health in the wake of terrorist attacks. Cambridge University Press.
  ISBN 978-0-521-83191-8
  .
• Ryan, Allan A. (2015). The 9/11 Terror Cases: Constitutional Challenges in the War against Al Qaeda. University Press of Kansas.
  ISBN 978-0-7006-2132-3
  .
• Strasser, Steven; Whitney, Craig R; United States. Congress. Senate. Select Committee on Intelligence, National Commission on Terrorist Attacks upon the United States (2004). The 9/11 investigations: staff reports of the 9/11 Commission: excerpts from the House-Senate joint inquiry report on 9/11: testimony from fourteen key witnesses, including Richard Clarke, George Tenet, and Condoleezza Rice. PublicAffairs.
  ISBN 978-1-58648-279-4
  .

External links

• National Commission on Terrorist Attacks Upon the United States official commission website
• List of victims
• September 11, 2001, Documentary Project from the U.S. Library of Congress, Memory.loc.gov
• September 11, 2001, Web Archive from the U.S. Library of Congress, Minerva
• National Security Archive
• September 11 Digital Archive: Saving the Histories of September 11, 2001, from the Center for History and New Media and the American Social History Project/Center for Media and Learning
• DoD: Khalid Sheikh Mohammed Verbatim Transcript of Combatant Status Review Tribunal Hearing for ISN 10024, from Wikisource
• The 9/11 Legacies Project, Oriental Institute, Czech Academy of Sciences, Prague
• 9/11 at 20: A Week of Reflection, Responsible Statecraft, The Quincy Institute

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